Key bit



FIG. 1 is a perspective view of the front, one side and one end of a key bit showing my new design;

FIG. 2 is a perspective view of the rear, opposite side and opposite end thereof;

FIG. 3 is a side elevational view thereof, the opposite side being a mirror image thereof; and,

FIG. 4 is an end elevational view of said opposite end.

The portions of the key shown in phantom lines do not constitute a part of the claimed design. 

The ornamental design for a key bit, as shown and described. 